Count/External Direction Mode

In this mode, input B controls the direction of the counter.

When Invert Counter Direction is disabled, the following occurs:

If input B is set to 0, the counter increments on the rising edges of Input A.
If the input B is set to 1, the counter decrements on the rising edges of Input A.

Direction Control: High = Decrement Low = Increment

When Invert Counter Direction is enabled, the operation of input B reverses. In this case, the following occurs:

If input B is set to 0, the counter decrements on the rising edge of input A.
If input B is set to 1, the counter increments on the rising edge of input A.

Count/External Direction Counting

Invert Counter Direction Setting	Input A (Count)	Input B (Direction)	Change in Count Value
Disabled	Rising edge	0 or open	1
	Rising edge	1	-1
Enabled	Rising edge	0 or open	-1
	Rising edge	1	1